2003/05/26 by Guang‐Han Cao, Guanghan Cao, Chunmu Feng +7 · 4 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-8984/15/33/102
published as J. Phys.: Condens. Matter 15 (2003) L519-L525 · 4 pages, 3 figures
arxiv created 2003/05/26 · openalex publication_date 2003/08/08 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We report the electrical, magnetic and thermal measurements on a layered cobalt oxyhydrate Na 0.31 CoO 2 ·1.3H 2 O. Bulk superconductivity at 4.3 K has been confirmed; however, the measured superconducting fraction is relatively low probably due to the sample's intrinsic two-dimensional characteristic. The compound exhibits weak-coupled and extreme type-II superconductivity with an average energy gap Δ a (0) and a Ginzburg–Landau parameter κ of ∼0.50 meV and 140, respectively. The temperature dependence of the normalized electronic specific heat in the superconducting state gives a clue to the superconducting gap structure.